mb/google/rex: Enable VPU

BUG=b:270529665
TEST=Verify the build and boot on Rex board

Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Change-Id: I0e3d3312c546a2a468fb906a08b8d3ec3e96c46a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72417
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb

@@ -56,6 +56,7 @@ chip soc/intel/meteorlake
 	device domain 0 on
 		device ref igpu on end
 		device ref dtt on end
+		device ref vpu on end
 		device ref xhci on end
 		device ref shared_sram on end
 		device ref heci1 on end